[Cum swallowing NTR while girlfriend is away] Dai and his childhood friend Yui are being trained to swallow by his girlfriend. Yui knew that she was being played with, but she also confirmed her sex friend's love every day by drinking the semen that she didn't drink. She thought, ``She really wants me to cum inside her.'' She is confessed by Dai, her childhood friend, who likes her, and in desperation, she has sex and drains her sperm.