He keeps his lips to hers, drinking in the taste of her and the sensation of their mouths melding, his tongue brushing against hers, heightening his desire as his cock slides within her. The slowdown doesn't ruin things, just mutes the arc of building sensation a bit, but he eventually builds it up again, and his movements become more erratic as it comes to a crest, causing him to spill into her as he breaks the kiss to let out a long rough exhale.