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Eddie survives the bats but they take not only his nipple, but a large portion of his cock.
He was never exactly small, but now he's got about half the length he used to and he spends so long with a catheter while he heals.
Him and Steve get together and ofc Steve used to be straight and Eddie has half a dick now so everybody, Steve included, assumes Steve's gonna top and Eddie's gonna bottom.
And sure, they do that sometimes, but other times Eddie pulls out his toys and fucks Steve with every dildo and vibrator and strap he owns - sometimes multiple at once - completely taking him apart as he writhes and whimpers beneath or on top of him.
Eddie also introduces Steve to kink and bdsm and queer culture and a whole new world where penetrative sex isn't the objective at all.
He makes Steve use his mouth to warm what's left of Eddie's cock.
When Eddie finds out he can talk Steve over the edge without ever laying a finger on him, he abuses this power for evil.
He uses his fingers and his mouth and his toys and random things he improvises and Steve is having better sex than he's ever even known was possible.
The catheter opened up a world of sounding for Eddie, which obviously he then introduces Steve to.