It certainly wasn't a bad idea, but right now career advice wasn't really occupying the frontal portions of Pike's headspace. He didn't think he could be blamed for that. He returned her kiss just as hungrily, sliding a little closer to her as he did. The trapping of his arms usually wouldn't have been a problem, and really it wasn't a problem now...but Pike just had too much of a buzz right now to let himself be trapped for more than a few seconds.
Instead he abruptly rolled his shoulders, arched his back, and fell back onto his back, bringing her with him thanks to the hold she had on his jacket. A second later, his arms were free. One hand went running up her back, while the other drifted down to her leg, hooked underneath it, and began running up it.
The whole time, he never broke the kiss. One thing he didn't do was the usual trick of nipping at her lip. Using your teeth in that fashion on an unprepared Slayer? Not the greatest way to survive sex.