Sherlock-
He loves it when you laugh. He can always seem to make you laugh for hours and it makes the bridge of your nose wrinkle up. You think it looks odd but Sherlock can't resist it. He insists you look "adorable".

John-
John loves it when you wake up first in the morning. This is because you always wake him up with a kiss on his forehead and he loves it.

Mycroft-
Mycroft is particularly fond of the way you fiddle with your hair. You curl strands around your fingers while you are reading or concentrating on something and after a few minutes, you let go and it falls into a perfect ringlet over your shoulder. It sends shivers down his spine and he often kisses you on the neck when you do this.

Greg-
Greg loves it when you get excited. He once came home from work early to surprise you and you were so ecstatic that you jumped up onto the sofa and fell into his arms. He grinned intensely and pulled you in for a passionate kiss.