Ok let me explain the whole situation first, so this is an AU where Anodites (from Ben 10) exist in the Harry Potter universe (I mean they technically could since they're made up of mana or purple magic/energy, but they're aliens so I highly doubt it, Harry Potter has more to do with mythological creatures than extra terrestrial ones anyway) Plot: You and Bill are trying to venture through a forest to find some peace and quiet after he took vacation from his job, but when a death-eater attacks you two, you turn into your anodite form in front of him for the first time and scared the death-eater off, but doing so provoked a consequence the possibility of losing your humanity, will you surrender your humanity over to your power-hungry indulgences or will you be sensible and not subject yourself to losing everything you know and love, including Bill.

Nothing sexual here, just a fluffy tickle headcannon for the estranged Billy Hargrove in Stranger Things. Billy belongs to the Duffer Brothers.

Just fluff, no sexual stuff.