User blog comment:TyLeefan421/Vocaloid Shipping/@comment-69.137.208.234-20130404215555/@comment-24.247.62.218-20130410033651

Hey, maybe that person just personally sees Len and Rin as twins anyway because fans are free to interpret vocaloids' relations in whatever way they want. And so therefore it can still be considered incest in his/her eyes and can be a legit reason for not liking a pairing.