Luke's heart was expanding as her kisses could still be felt all over his face and when his head exploded, he grabbed her jaws and kissed her passionately.
Isabella didn't expect that, obviously. She was already planning to feed him when he just ceased her jaws and mash his lips on hers.
Since he was going to be her husband and she loved everything about him, she relented and played along. The kiss was another level of passion that even when the kiss ended, he touched her tongue again with his and sucked her lower lip.
Luke didn't want to let go, causing his teeth to hold her lips. However, eventually, he let her lips go. He said nothing and Isabella returned the gesture by just staring into his grey eyes. They were so beautiful that she began to thank fate for giving her, Luke. Her children would possess those pairs of beautiful grey eyes.