@b4nji
He likes both, but likely feels a bit bad for a shitty performance for their first attempt. Plus, he is struggling in a fight between his fetish and his girlfriend, where both happen to be a product of the same person. Remember, this dude is so in deep with his fetish that he tried their first time with her in lizard form, and literally made a literal skinsuit of/from her and wore it (iirc).
Put it this way, he origionally fell in love with her literal shed skin, but now is also trying his hardest to love the source just as much, which isn't quite as easy for him. His first big mistake though was trying to do fetish shit durring both of their first time.
Nornally, unless it is like hardcore BDSM or something extreme, this isn't too much of an issue, and at worst, you both often times can pass it off as just being a non-serious attempt. But he wasn't doing it just to be kinky. He wanted to fuck that lizard form. Which essentially was attempting a "legal" form of exotic bestiality. In other words, they started off doing something almost no one had likely ever tried, and expected it to work out flawlessly, with just what they knew about it from essentially googling "How do lizards mate?"