Like every year, Giulia and Sara had left for their first holiday in some warm place, just those four or five days at the turn of April.

Since their finances allowed them, this year they had chosen the Canaries island as their destination.

Not the usual stay in Tenerife, but on the island of Las Palmas, the most volcanic of the archipelago.

Despite being in their early twenties, they weren't looking for the entertainment of the major islands, but for a relaxing stay in a very beautiful landscape.

The days passed between volcanic excursions and tanning on the beaches south of the island.

The climate was really favourable, except that in the evening a strong wind used to rise which probably came directly from the ocean.

Giulia, always chilly, was very careful, dressing appropriately, while her friend a little for exhibitionism, a little for listlessness always came out a little covered.

It was the third day of vacation, about halfway through, the village where they slept that night was Fuencaliente a very small and characteristic cluster of houses. The usual basic shops, the Pension Central where they stayed and a few restaurants.

That evening the wind didn't really let up and even Sara, who usually tolerated it very well, began to complain, just as soon as you left a restaurant.

- Giulia, do you mind if we go back to the hotel?

- I'm tired and this terrible wind made my back ache too!

Giulia, sleepy as she was, with a full belly, did not let herself be prayed for.

- Quiet, so much this village we have already shot it twice far and wide!

- Aren't you feeling pretty good?

- Nothing special, I must have caught a little cold and my back hurts a little. A pain killer will sort it out for sure!

After greeting the funny doorman, they went up to the room around eleven in the evening.

They had two single beds separated by a single small bedside table, but they were very used to sleeping together, having known each other for many years.

Before the usual preparations, however, Sara immediately sought something to calm the pain.

Forgetful as she was, it was a lot if she had brought the beauty case!

Which in fact turned out to contain only body creams and an old blister of pills.

- Giulia, don't you happen to have something stronger?

She asked, waving the medicine.

- No, I just have some basic stuff too.

- But you will see that if you take it now, in the morning you will already be better!!

He answered her without paying too much attention while she was intent on undressing.

Sara, accustomed to her friend's distracted responses, filled a glass with water and poured the medicine into it and, waiting for the powder to dissolve, she too began to undress.

They were used to undressing together, they knew their bodies, they had never felt embarrassed. Giulia was taller, not very shapely, long legs, a normal ass, small breasts and still very firm. Sara was smaller and more shapely; she had the most feminine curves, which flowed into a round and firm butt, which Giulia often envied her.

Given the heat at night, they both slept with only their briefs, the hotel walls sheltered them from the air and the heat was almost unbearable at times.

Giulia, as usual, wore a cotton thong that she used to change for the night with a pair of more comfortable briefs.

Now semi-naked, she lowered those too, completely uncovering her body, showing without any embarrassment even her private parts, covered with a light blonde hair.

In an instant she put on her panties and lay down on the bed, turned to the bed of her friend who had already almost fallen asleep.

Sleep came quickly, only a cotton sheet covered their young bodies, but perhaps for Sara it was too little.

The morning was not long in coming.

- Giulia, Giulia..

She woke up to be called in a low voice.

When she managed to connect, she opened her eyes and saw in front of her the face of her really suffering friend.

- I am really in pain!

- My back is blocked, as soon as I move, I cannot breathe!

Giulia reactivated immediately seeing Sara's expression.

- You have also run out of medicines!

- Do you want me to go to the pharmacy and get you something?

Sara would have avoided this boredom, but the pain was really too much!

- If you don't mind?

- But how will you make yourself understood?

- I find a way. No worries!

She quickly got out of bed.

- I'll go now!

With her face still sleepy, she took the first dress she had on hand, put it on without even a bra. She put on her flip-flops and headed for the door.

- I'll be right, the pharmacy is close to here, I hope to find something.

Sara leaned in waiting for her friend, looking for the position that bothered her least.

In a couple of minutes, she had reached the town square, and there was the pharmacy, the “Munoz”. She stared at it for a moment, thinking about how to be explained, took a deep breath and entered.

The explanation was not immediate, but between gestures and a few words in a sort between Italian and Spanish from the lady at the pharmacy, she finally got the medicines. She walked back to the hotel, with the pharmacy bag, thinking of Sara, thinking that now the worst would come, thinking that her friend would not be very happy.

In the meantime, Sara had remained as still as possible, dressed only in a pair of green cotton panties, given the heat that was already starting to be felt in the morning. She was waiting impatiently for her friend to return from the pharmacy, she could no longer bear that pain in the back of her back; she would have done everything to get better… almost everything.

The wait ended, the room door opened.

Giulia was holding a somewhat bulky bag that immediately made her friend curious and worried.

- What did they give you?

She knew she would take it badly, but it was an effective remedy and even on her when the same thing happened to her it took effect in no time.

- He said you need to have injections.

A cold shower hit Sara, who remained silent for a few moments staring at her friend still standing in front of her.

- You must be kidding right? You know I hate injections! What the fuck did you get? And then, who would do it to me ???

Giulia let her friend boil off, it was natural that she was angry! But she already had a plan!

- First of all calm down! We are on a tiny island, with a tiny pharmacy where they don't speak my language! No one has ever died from a butt shot!

The answer arrived shortly.

- But then the plural 'of injectionS'? But why? And then I repeat who is going to make it? Did they even give you a nurse in the box?

Giulia became a bit impatient but tried to keep calm.

- …injections' is because you have to do them for at least a couple of days to make the muscle burn out.

- And I will do it!

Sara was speechless for a second. Giulia had thrown it there, not even knowing if she had made the right choice.

- You? And when have you ever done an injection before?

- Never! But I've seen my sister make a lot of it, to me and on her friends.

- Would you like me to go find someone? Maybe a dirty old man who also looks at your ass?

Sara, that in the meantime didn’t moved an inch from the position she was in, did not have many choices, and the pain was getting worse!

- I think we're going to screw up! But I see no alternative, so let's do these shots!

Giulia made a sort of satisfied face, at least the situation was unblocked!

Now she had to gather all the information from the memories of his sister Viola's injections. And she had to do it in a second, the time to take the drugs out of the package and unwrap a syringes.

When her sister gave them to her, she put both vials of medicine in the same syringe, but by heart it looked like a larger syringe. When she did that cycle to Camilla instead she did two at a time, one on each buttock. She remembered hers as a bit painful, while the treatment for Camilla was terrible for a week, the poor woman underwent two very painful injections a day! It wasn't safe to mix the two drugs in the same syringe, plus if the syringe was too small? No, better to have two injections. Sara wouldhave suffered a little bit more but she didn't know the procedure anyway, so the protests would have been minimal!

- Ok, now I have already prepared both of the injections, so we do them one after the other and we will be good!

- Do as you like, just hurry up!

In the room there were not many floors to lean on, so she sat on her bed, next to Sara's and used the bedside table between the two beds to put everything on it.

She took two syringes from the box, removed the packaging and placed them next to her friend, who could not help but follow the preparation step by step.

She took the first vial, the Muscoril, broke off the top of the clear vial, took the syringe and removed the cap, just as she had seen his older sister do so many times. With great care she put the needle inside the vial and aspirated all the transparent liquid, then pointed the needle upwards and with the classic move she let a few drops out of the syringe in order to remove the air.

Sara did not miss a second of the procedure and seeing the liquid come out of the glittering needle made her remember the other injections she had to do, this memory certainly did not reassure her.

It was the turn of Ketoprofen, so it was written on the package, from what Giulia had guessed this one served as a painkiller and the other as a relaxant for the contracted muscle.

She repeated the same steps as the first injection, this time the liquid was opaquer and more seemed slightly thicker. The two injections were ready, both placed on the bedside table.

She looked at her friend.

- I'm ready!

- Pull your panties down!

Sara knew that the time had come. He settled well on the bed, with her belly under then with both hands she grabbed the elastic of the briefs, making them go down to mid-thigh, thus revealing his shapely and firm butt.

Giulia knew that butt well, they had been naked together a lot of times, but this time it made her feel quite different!

She opened the disinfectant, spreading the unmistakable smell in the air, which caused a shiver down her friend's back. She poured some on the cotton pad and went to Sara's side.

- I try to do my best! You stay relaxed!

- Ok! I try, but take it easy that I have a crazy fear!!

As she had seen her sister do the other times, she began to massage the upper part of her friend's right buttock, which in contact with the cold pad stiffened the buttock a little, but immediately felt a strong pang in the back.

After a few moments Giulia interrupted the massage and took the first syringe with Muscoril.

She took off the plastic cap, she was ready, she was going to do the first injection of her life, on her best friend's butt!

- Take a deep breath!

She did the same too, she was quite nervous.

She placed two fingers on her friend's buttock and, indeed, with a sharp blow, brought the needle as close as possible to the skin, and then slowly planted Sara's butt, who didn't take it very well!

- OOUUCCH! I'm not a pincushion!

- Shut up, don't complain, it's not easy even for me!

The needle had entered completely, she gripped the syringe more comfortably and began to press on the plunger to let the medicine enter.

Sara gritted her teeth, in fact the medicine did not burn, and in about five seconds Giulia injected it all.

- Done! Now I'll take off the needle and give you a massage!

- Be gentle please…

She slowly removed the needle from the flesh and placed the syringe on the bedside table with the needle still uncovered. A drop of blood peeped out from her friend's ass, which she immediately went to dab with the cotton swab she had used earlier.

- Good girl… give me a nice massage!

Sara said in the tone of a whimpering child.

Giulia slowly massaged her little ass for a few moments, it was really nice!

But they still had the second injection to do and she interrupted her friend's moment of relaxation.

- Come on, you're good! We have to do the second!

For a moment she had almost forgotten about it, but that feeling of nervousness returned immediately and soon turned into a shiver all over her body.

....end of the first part....