https://www.dlsite.com/books/work/=/product_id/BJ280164.html
https://www.dlsite.com/books/work/=/product_id/BJ01155798.html (English)
https://coolmic.me/titles/2785 (English)
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N.T.R. Sex Wars - Playboy's Depraved Massage VS. Childhood Friend's Sensual Touch

Jumping between your cool childhood friend and a handsome playboy? Passionate touches that melt your body and heart…!?
Indeed, university student Aoi finds herself in quite the conundrum when two of the hottest guys on campus both ask her out. At the same time.
In her surprise, she recalls a conversation with a friend, and blurts out that "testing sexual chemistry is important!" And the die was cast…
First, the most famous playboy and prettiest face around campus, Umetaro Tokitsu, administers a sensual and climactic massage!
Then, her stoic childhood friend, Ryusei Hinata takes the reins and pushes her onto his bed…
Her fateful words about "sexual chemistry" brought about this scandalous three-way relationship, but who will Aoi ultimately choose? Other than endless orgasms at the hands of these two loverboys, what else does Aoi's fate hold…?