Thank you for your message (made me happy hehe)!
Concerning watashi no megane-kun, I already read it but decided against adding it to this list for it was just too melodramatic imo. Same for the yaoi "Bronze". By the way, all the non BL ones are regrouped at the end of this list.
One more thing: I've been hesitating about adding that one (non BL, sub BL): http://www.mangago.me/read-manga/oujitachi_wa_izonsuru/
What do you think?
Oh myy, I love that manga! (⁎⁍﹃ ⁍⁎)♡ And about your question, hmm the last story definitely fits the possessiveness theme however for the first story, I'm not too sure about it. The big bro is more the doting & jealous (maybe a bit tenacious?? it shows in p.91) type. He doesn't show hints of possessiveness like "she's mine, back off" or kiss her in front of ppl to show ppl she's his or leave some hickeys on her neck lol (Except that one time during his childhood when he punched his sis' friend cuz he saw them talking)
Haha so long short story, I guess you can add it cuz the last story fits the main theme of your list (๑•ㅂ•)و✧
Ohh and by the last story I meant the story that starts at p.121 (NOT the side-story of Tsubaki, the lil bro haha)
My guilty pleasure hehe ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄ ♡ Thx for making such a great list!
Also, it's not a BL but you can try this out:
http://www.mangago.me/read-manga/watashi_no_megane_kun/