My Jealous Boyfriend and My Vibrator

One night when her boyfriend Keiyu isn't home, Ayame decides to experiment with using a vibrator, figuring it will kill time and help her fall asleep. What she didn't figure was that Keiyu had come home early, heard her talking out loud to a daydream of Keiyu while using the vibrator...and become super jealous of the "sex" Ayame was having with the daydream version of himself!! How will the couple resolve this rather unusual case of envy?