For me, after Ellen introduced me to the art of female masturbation (as detailed in the link in the question), she dared me/insisted that I return the favor.
To be completely honest, I didn't know what I was doing. I was a late bloomer and was part of a pedophile doctor's "developmental study" that had me doing daily "therapy exercises" - basically dry masturbation - that I'd have to demonstrate for the doctor.
Anyway, back to Ellen. We were playing truth or dare, and after masturbating for me, she dared me to masturbate for her. Now, I knew about jerking off, or thought that I did. Likewise, I knew about ejaculations, but only in theory.
So after being dared, I stood up and dropped my jeans to my ankles and pulled my tightie-whities to mid-thigh and started stroking my newly larger erection. Ellen stopped me and told me to get completely naked and stand in front of her. So I did, and stroked my dick the way my pedophile-pediatrician had taught me.
After a minute or si, Ellen stopped me again, and got up and went into the bathroom. She came back with a tube of hand lotion and handed it to me. I stood there and looked at her for a minute and she said something about lubrication makes it better. When she realized that I didn't really know what I was doing, she coached me through it - and this was clearly not her first time. She had me stand between her knees and resume. She'd tell me to speed up or slow down, to squeeze my balls or let them go, and when I came, it was explosive - I had no idea what was happening - I mean, I knew in theory, but really didn't know what to expect - and I shot my load on her bare tits. I wanted to apologize again, but she rubbed my cum into her skin and over her boobs.
That was not the last time I masturbated with a member of the losers table, but it was the first time I masturbated to completion - and having Ellen introduce me to incorporating lotion created a masturbation fiend!