No way! That would be crazy. Wouldn't he have remembered he had s** with her? :o. Although this is a manga, so anything can happen 
Comment by Elena Mirea on EGAKN1GHT
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@Elena Mirea I watched a C-Drama (Loving, Never forgetting) that the CEO was so wasted that he had a one night stand with the FL, impregnate her and didn't remember her until their child needed a blood transfusion and she revealed everything to him. So in fiction stories everything is possible.