He's not sure how it happened. One minute they're standing in the darkened ops room arguing over his action figure. The next they're actually tussling over it, almost like him and Tommy when they were little. But then things get really strange. He doesn't know who started it, suddenly they're making out like bandits. It's kind of weird, angular planes and hard muscles rather than soft curves, but kind of nice. Actually, it's more than kind of nice, but still kind of weird and that's okay.
Frankie thinks he maybe loses track of time for a while, because the next thing knows the door bangs open and they jump guiltily apart at the sight of Jane standing in the doorway. He half expects her to grab them by their collars and separate them like she used to when they were kids. Only this time she hasn't busted him wrestling his their little brother; this time she's busted him kissing (or being kissed by) her partner.
For a moment there's silence before Jane manages to find her voice. "I'll um, I'll come back later. When you two are less..." she waves a hand at them, "...busy." She takes a step backward then pauses. "By the way," she points to the floor, "you dropped your doll." Then she spins and stalks toward Maura, threading her arm through the other woman's and muttering, "I need a drink." The last thing Frankie hears before the door swings shut is Maura's puzzled voice, "Tonsil-hockey?"
Before Frankie can figure out what to say, Frost has pulled him back for another kiss. Must be the Rizzoli charm. If Janie can get a babe like Maura, and he can snag a hottie like Frost, they must have something going for them. Now if Korsack would just stop making puppy dog eyes at Ma, the world would be a perfect place.