please recommend a sweet and fluffy yaoi or shonen ai manga (a long manga with lots of ch....

http://www.mangago.me/home/mangalist/10654/
http://www.mangago.me/home/mangalist/200/

http://www.mangago.me/read-manga/honto_yajuu/
http://www.mangago.me/read-manga/rutta_to_kodama/
http://www.mangago.me/read-manga/heart_no_kakurega/
http://www.mangago.me/read-manga/katekyo/
http://www.mangago.me/read-manga/yume_musubi_koi_musubi/

maybe you like one of these :)
http://www.mangago.me/read-manga/oinarisama_no_honey_bunny/
http://www.mangago.me/read-manga/mazu_wa_hitokuchi/
http://www.mangago.me/read-manga/momoiro_tengu/
http://www.mangago.me/read-manga/konya_mo_nemurenai/
http://www.mangago.me/read-manga/aitsu_no_daihonmei/

Err, I don't know a lot of long fluffy mangas. How about these:
http://www.mangago.me/read-manga/kimi_note/
Seven chapters

http://www.mangago.me/read-manga/bukiyou_na_silent/
Fifteen chapters right now

http://www.mangago.me/read-manga/katekyo/
26 chapters

http://www.mangago.me/read-manga/koitomo_/
There's six chapters but its sweet. Its a spin-off of the Katekyo

http://www.mangago.me/read-manga/aitsu_no_daihonmei/
It is long x3

I'm not sure if you read them though >w<

Try the long ones from here -
http://www.mangago.me/home/mangalist/26616/
http://www.mangago.me/home/mangalist/71919/