http://www.dlsite.com/maniax/work/=/product_id/RJ178807.html
http://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_096443/

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MC (Taka) has two childhood friends, the girl (Kaoru) and the other silhouetted guy (Ken). Kaoru and Ken are dating, but Ken (who just goes home instead of in any clubs and is kind of lethargic) isn't able to sexually satisfy Kaoru, who has an abnormally high sex drive. She resorts to masturbation, even at school, but also eventually gets Taka to help minister to her desires. Taka feels really bad about doing this to a bro, as he's friends with both, but he gives in to her insistence and it turns out (of course) that he's more able to give her what she needs than Ken.

Conclusion is three months later, where Ken and Kaoru have broken up and Taka and Kaoru have started dating. (They still haven't really told Ken out of embarrassment.) But, hey, after breaking up with Kaoru Ken has straightened up, is even involved in soccer club, and seems to have gotten out of his rut. So all's well that end's well for all three?

Base +4, APepper -6, nowittycomment +11, Acerola +11, starr +6, Gitami +12, corruptedcode +6, Drksrpnt +46, roarr23 +6, DDude8 +14, IncognitoMaud +5, Syokool +8, JOhnny W +8, and 8 more...

@Thacker

Thanks for the synopsis!

Base +6

not very ntr, just unsatisfied+breakup.

Oh and there is kabedon :P

Base +7