Mitsu is one of my cats who is initially timid with people he doesn't know and is very sound sensitive. Once he knows you though, he will happily keep your lap warm.
He joined our family as a kitten, a year after Myszka. We followed an almost text book introduction and it took four days to sucessfully introduce them to each other. The pair are now inseperable, playing, washing, sleeping together, though of course like all relationships they do still have their moments.
With me and my partner Mitsu is very loving and, like most siamese, chatting to us constantly. He has a lot of energy and if we haven't yet played with him that day he will loudly let us know! He's happy to play on his own, if not with his brother, and often gets a bottle brush tail, before hurtling up and down the stairs.