Specifically looking for doujin recs. You know the trope

>totally straight dude
>meets josou seme femboy/trap who decides to pursue him
>"I have a penis you know"
>"your first kiss was with a guy, that's so gay!"
>"are you sure you're OK having sex with a man?"
>aggressive (or tender, that's cool too) brosexuality ensues

pic from exhentai.org/g/3315738/ed74d12afc/