No, he borrows her the bike

"What... no its not mine..." He mutters, slightly confused.

"But your name is clearly on it, that means its yours doesn't it?" She asks, pointing at the signature.

"Uh... Yes?" Bob answers, even more confused but assuming that given Sombra's reputation he is in hot water no matter what he says.

"So, can I borrow it?"

Bob sighs before answering. "Yes, sure just bring it back ASAP. I'll prepare it for you, it will be ready in 5 minutes. Just remember, the experimental features are disabled..." He said in defeat, deciding that letting her have her way is the path of less resistance and likely would get him in less trouble in the long run rather than trying to deny the schemer.

With that side he fixed up the bike and waved sombra off. He got a nice view of her toned backside as she straddled the bike and sped away. What would he give to own that piece...