Yaoi where one of the male leads has lots of experience while the other has little to none...

Love gym

https://www.mangago.zone/read-manga/rumspringa_no_joukei/

https://www.mangago.zone/read-manga/junai_drop_out/

https://www.mangago.zone/read-manga/pussy_king_sama_no_akuheki/

https://www.mangago.zone/read-manga/highest_order/

https://www.mangago.zone/read-manga/hetakuso_love_step/

I was started to lose hope after posting this question twice and no one replying until now. I appreciate it so much. Thanks everyone! (⌒▽⌒)

Np! I'm happy to help <3 I hope you like them