Oh, it's the magical whip that does it, so that when Filch has finished fucking Fred in front of an appalled George and the whip's effect has begun to wear off after a while, Filch starts the whole thing over again but with George this time, and now George is getting all hot over it while Fred is going eew, eew, but he still has Filch's come seeping out of him and his body kind of remembers the pleasure even though his mind doesn't agree, and the whole thing kind of puts them off pranking for almost a whole day afterwards. Until they realise they kind of want to do it again.
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pingrid