Oi

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

http://www.mangago.zone/read-manga/our_house_love_trouble/
http://www.mangago.zone/read-manga/night_milk_heads/

??

http://www.mangago.zone/read-manga/kuroneko_kareshi_no_afurekata/mf/v01/c001/
http://www.mangago.zone/read-manga/hot_springs_flag_checkpoint/
http://www.mangago.zone/read-manga/retsujo_love_cross/
yes I'm into this kind of stuff too

Oi! Shut up

Cry for me / ending part though/

It's worth it read it from the beginning, but the scene you want is Ch 3 from http://www.mangago.zone/read-manga/harapeko_usagi_to_koisuru_ookami/
They don't have sex IN the hot spring, just in a hotel room after they bathe tho