Vanair
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You said you were doing it for fun so my review may be harsher than needed. My main problem with the story is that the mc being a reincarnated person has absolutly no effect on the story. You could have had the system awaken at a certain age like The Gamer, but connected to the multiverse with abyss auction. The mc could have aquired his sexual skill there, being attracted to all the beauties around him.