The loss of that hand was to be mourned, yes, but Rhys barely had time to think about the loss of sensation as things happened all at once. The harder thrusts down, and up, were sending Joseph's cock straight into a part of the fledgling that made him want to whimper and cry out all at the same time. Some of the things coming out of his mouth might have even sounded exactly like that.
Right as his lover came up that last time, the younger kindred slammed himself down, throwing himself over the edge with one movement, making him cry out louder than before. His whole lower body shuddered as he was pulled forward by his hair for that kiss, pulling all he could out of being fulled and full. They broke apart after a moment, yes, but Rhys barely noticed as he kept at the kiss. He could deal with the mess later, nothing was more important in that moment than this.