Friends discovering sexual pleasure with each other and then going out is always allllways...

if so...do you have in mind any recommendation manga with the same theme...i would love to find more (=・ω・=)

oh boy I'm bad at digging out bl manga I've read before.. So here are some that may or may not fall in that catagory:
Odu-kun no Vita Sexualis (one of the oneshots included in the volume)
Toshigoro No Otokonoko To Are
Kimi Note (third story)
B.S.S.M. - Blood Sugar Sex Magic

I'm pretty sure I read more good fluff but they didn't stick in my memory.

thank you so much..don't worry..all the list above is enough to satisfy my addiction for a week