Yes, it is not uncommon for a kitten/cat to suckle the nipple area of another cat wether it be male or female especially before taking a nap. Kittens have been known to suckle on a trusted persons ear lobe or chin as a sign of nurturing and affection.
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Because kittens just have an instinct to suckle, if a kitten lacks milk it will suckle basicaly anyhing, even your arm.
Either the kitten is very hungry and needs its mother very badly, or you are mistaken about the gender of your cat.
Because they are young and get confuesd.So they think the male cat is the mommy cat.Sometimes
For the same reason it suckles at its mothers.
It is instinct, it may be hungry, or it is comforting to it.