Zup! Please help me find this YAOI manga its a smut the only thing I can remember is the c...

http://www.mangago.zone/read-manga/oshioki_gakuen/ ?

http://www.mangago.zone/read-manga/gouin_sakka_to_makeinu_no_hatsukoi/
pretty sure its this, ahaha

http://www.mangago.zone/read-manga/oshioki_gakuen/

Wow! That was fast! Thanks a lot you guys!!!ヾ(☆▽☆)

Sorry but its not this one BUT thanks to you i' be discovered a nice YAOI manga to read!! Thanks!!

It's I"VE not ( I'be) press the wrong letter

That plot is gold, man! XD
You missed the part when he lost his bet because his d**k touched the vaulting box.