Leon was a doctor and he was adept at acupuncture and massages. The years of practice had allowed him to perform the medical skills without conscious thought. Although, his hands haven't fully regain his previous level of dexterity, it was still dexterous. Leon was unaware that he had used some of his massaging skills and gave Mary a brief but pleasurable experience in that one moment.
Haha did someone just say “Reincarnation of the Strongest Sword God”. Not that I that I mind it in the least but this is so far almost exactly how that book started.