Do you mean from the get go? as in they are together since the first chapter?
practically every yaoi manga ending right there
Yes if you can
give me like 15 minutes, and i'll give you several (๑•ㅂ•)و✧
http://www.mangago.me/read-manga/katekyo/
in this one they aren't living together since the first chapter, aka the first arc of the manga but in the second one they do, and its both sexy and fluffy
http://www.mangago.me/read-manga/shiawase_gohan_maki_to_hanazawa/
this is a very fluffy manga about the pair and their daily life
http://www.mangago.me/read-manga/hachimitsu_darling/
in chapter one they decide to live together, real cute and funny, they share the room a bit later, but worth the read
http://www.mangago.me/read-manga/rutta_to_kodama/
they are highschool students and they share a room in a dorm
http://www.mangago.me/read-manga/konya_mo_nemurenai/
they start living together in the first chapter, it's really funny, trust me
http://www.mangago.me/read-manga/kimi_no_nioi_ga_suki/
this ones nice
http://www.mangago.me/read-manga/kore_ga_koi/
this one doesn't have living together thing, but the first couple story is hella cute so i wanted to share it ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
http://www.mangago.me/read-manga/kokoro_kanda_neko/
they don't start living together right away but they have a lot of chapters from that point on and it's nice
http://www.mangago.me/read-manga/ano_machi_ni_sunderu_karera_no_koto_haikyuu_dj/ & http://www.mangago.me/read-manga/haikyuu_dj_kono_machi_ni_sunderu_karera_no_koto/ the two go in a pair. it's a dj around two haikyuu characters. but even if you didn't watch the anime or read the manga this dj is more of a slice of life kind of thing which doesn't base its self to heavily on the franchise so you can understand it even without any prior knowledge
these are the ones i thought of so far. i know i have some more, i just can't remember how to find them hahahahahahah
but if i do remember them i'll send them here as an answer to this question
hope you enjoy the ones i sent you (๑•ㅂ•)و✧
Thank you...
Oh, I will, really, thank’s
A Yaoi manga where they live in the same house and sleep in the same room, Thank You