Yeah, this is complete shit. Unless she started spiking Nightwing's water bottle with Viagra BEFORE she shot Blockbuster, there's no way in hell Nightwing could have gotten it up while he was having a nervous breakdown...and even with drugs, I'd give it a 50/50 chance at most.
Trust me, I'm a guy and I've had a nervous breakdown from generalized stress. Your sex hormones shut down completely for at least a couple weeks.
Shame, really. Tarantula might have eventually become an interesting character, if Devin Grayson hadn't decided to use her as an Author Stand-In Sue for her own warped fantasies.
Whoever edited this would have done better to hire a male hooker for Ms. Grayson, dress the rentboy up in a Nightwing costume, and tell her to 'go get it out of her system' before rewriting this pile of crap.