Gay man trying to turnng himself straight

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There is this thing I remember that I can't tell if I have actually seen/heard/played.

So it's about a gay man (for whatever circumstances) needing to turn himself straight He gets help from a female friend, and forces fimself to jerk off to her (and maybe other sexual acts, don't remember).
I remember him forcing himself to the point where he either starts to get ill, and even vomiting (if i remember correctly)

Is there anyone who knows where I have this from?

Also
Pic completely unrelated (From a fucking hillarious manga called GrandBlue)