
Pretty sure you know this one but
http://www.mangago.zone/read-manga/pet_keiyaku/
Basically in the BDSM type of manga.. but never in main focus. Love Prison has quite long scenes about orgasm denial... have you searched the tags?

Sorry I meant love prism. http://www.mangago.zone/read-manga/love_prism/
In case you haven't read it yet it says it's complete because (if I remember correctly) the author died. You can read it it kinda has an end it's not too unsatisfying but I guess the story was meant to be longer.. idk sorry for rambling. Hope that was a little help? (⊙…⊙ )( ̄∇ ̄")
PLEASE help me find some yaoi with orgasm denial or edging I NEED IT SO BAD PLEASE Σ(っ°Д °;)っ and thank you!!! I have only ever encountered a few of these scenes and want more... any suggestions are appreciated ヾ(☆▽☆)