[Gai can't help it-- now he starts laughing, not even bothering to squirm away from that play-punch. Instead, he slips his arms around her waist to pull her against him, then half-rolls over so that she's resting partially atop him. There, much better.]

With him, four times would be overkill. You would only need to hit him once and he'd immediately stop whatever he was doing and start apologizing to you.