He was already being a good fake boyfriend by the flowers alone, but also letting Buffy take the reins and lead them where he suggested they go had him really in the winning for best fake boyfriend ever.

"Yes!" Buffy nearly jumped in excitement when Peter confirmed he had used weapons previously. Instead she abruptly stopped in her tracks, and possibly him in his, to turn and smile, genuinely, before her head tilted in curiosity. He built stuff? That was good to know. Although for a split second there she hoped Peter hadn't meant he built people from parts of other people. Wouldn't be the first time someone tried that out. See fake boyfriend, her life was weird too.

"Of course I know that!" She laughed after letting out a sigh of relief. "Because you're a nerd." That sounded harsh and by no means how she intended. "In a good way! In a sexy way!" She momentarily looked mortified. That too was not what she meant to say. "Not that I'm checking you out. I'm not. Like, at all." Her foot lived in her mouth if that wasn't evident yet. Except she had a role. So of course she kept on talking. "Because I have! Seeing as you're my boyfriend and obviously I would have to check you out with my eyes and my hands in order to be dating as we are, and yes to the tinkering. Please. To an extent? I mean I don't want laser beams shooting out of a crossbow or a gun, or a stake." Buffy continued. "That would probably make it a lightsaber of some kind if a stake had laser beams shooting through it. Right? Not that you could do that. Can you? I mean here. With probably shitty resources as far as equipment to work with goes."

She wouldn't mind him being a nerd if he didn't mind she talked a lot.