It's not cheating if it's sex practice! Just make sure you don't enjoy it too much, and use techniques like "finger-sucking" and "just the tip" to avoid getting too close to the real thing. But if you slip up and accidentally let your friend's boyfriend pour his cum in you, that's okay. It's only practice.

(Source: Irodori Comics)

1. Tomodachi no Okaa-san to SeFri ni Narimashita. (友達のお母さんとセフレになりました。, I Became Fuck Buddies With My Friend's Mom) 
2. Ecchi no Renshuu wa Uwaki janai yo ne?(エッチの練習は浮気じゃないよね？, Don't Cheat, Practice Sex) 
3. Shisen (視線); Comic G-Es Vol. 3 
4. Kuro Gal-chan to Himitsu no Kaki Hoshuu (黒ギャルちゃんとヒミツの夏期補習)

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