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http://www.mangago.zone/read-manga/hitotsu_futatsu_himitsu ? That's the first thing that comes into my mind. XD
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http://www.mangago.zone/read-manga/iya_yo_yamete_yo/ - Band-aids
http://www.mangago.zone/read-manga/hitotsu_futatsu_himitsu/ - Inverted nipple
http://www.mangago.zone/read-manga/hitotsu_futatsu_himitsu/ - Inverted nipple
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http://www.mangago.zone/read-manga/hitotsu_futatsu_himitsu/ ?
Probably not tho ╮( ̄▽ ̄)╭
I've been searching for a manga I read a while back, yaoi, about two guys getting together after finding out the uke had bandaids on his nipples becuz they were too sensitive? or something about them being introverted?... so of course the seme had to "help" him by offering to suck them out! Anything comes to your mind?