https://www.dlsite.com/maniax/work/=/product_id/RJ01104886.html

Synopsis: Track captain gets TSFed into girl by jealous team mate with a magic app. Captain regains memory of life as a guy then gets raped and begins to accept life as a girl. I think it's then revealed that it was the captains girlfriend that wanted her boyfriend TSFed? not sure on that part. Afterwards, captain is take to a strip club and turns into a gyaru slut. In last few pages the jealous team mate gets the tables flipped on him, getting TSFed as well

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恶有恶报了属于是

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明明是我喜欢的性转，但却总觉得这个作者的作品差点味道……

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我直接在评论区@今川义元

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@zubenalgenubi MC (Kanon as a girl) gets used to life as a girl, but laments they can never reach the same running times as when they were a boy. The blonde guy that finished behind him is the one that did it, and arranged for the MC's girlfriend to then be his girlfriend after the reality change. Kanon was taken to the club by the former GF and the blonde guy (Ryuu I think?) where predictably Kanon falls to the power of the D. It's then shown Kanon drops out of track club and commits to getting thiccer and selling themself for sex.

At the end, we find out Ryuu knows the owner of the club, who gave him the app. Except he over-used the app to make both Kanon and the former GF slutty with high sensitivity etc. which pissed him off bc he only agreed to let him use it to change Kanon into a girl. So he uses the app on Ryuu and turns him into a girl to have him "work off the debt of using the app... 50 years ought to do it..." and we find out he's a demon of some sort in the end it seems. Kanon apparently became a famous AV actress after that.

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