Mallek would start thrashing about due to the unexpected touch, but once he found out it was his lover doing it, he’d calm down, and tell them kindly to not touch them like that out of the blue. His face is such a deep cerulean! Must’ve been the troll equivalent of having someone shove their hands up their shirt. Vulgar!
Once he found a proper moment, he’d sit with you and explain to you the whole thing involving these “blue marks on his skin” and his biology. By the end of the short conversation you just had, he lets you rub them, now that you’re both at a safe and private environment. He blushes and laughs at your every touch. Must be a ticklish place for him!