You can try this one
http://www.mangago.zone/read-manga/kami_sama_no_iutoori_moegi_yuu
http://www.mangago.zone/read-manga/mauri_to_ryuu/
It's really good, about dragons and stuff.
Not sur if u mean by over protective gentle seme or possesif but
Try this tho its one shot http://www.mangago.zone/read-manga/tsunagaru_koi/nbt/4601b607df6edf60
or this
http://www.mangago.zone/read-manga/rutta_to_kodama/mh/c001/
http://www.mangago.zone/read-manga/kaeru_no_prince_sama/mf/
http://www.mangago.zone/read-manga/sensei_wa_butchozura_shite_yatte_kuru/mi/cb662567f2f874a96f1b0e86f83081b3_chapter
http://www.mangago.zone/read-manga/houyou_jikken
http://www.mangago.zone/read-manga/harapeko_usagi_to_koisuru_ookami
Maybe try this
http://www.mangago.zone/read-manga/sweet_crazy_days/
can someone recommend me a yaoi manga, about a overprotective boyfriend and deeply in love with his uke. and of course has to be a happy ending(๑•ㅂ•)و✧