If they are close friend,relative, or something of that sort, it is never too much to ask for the companionship of someone. You aren't guaranteed a "Yes" or "No" answer, but that doesn't mean you can't ask.
we all need somebody, and sometimes it's a specific one that we need in order to survive. but that somebody may not always be there for you. no it's not too much to ask, but sometimes girl, u gotta keep your head up, smile, and make it in this world. :) (this reminded me of my profile LOL xD)
No, being there for each other is a MUST in real friendships, NO MATTER WHAT. I'm sorry if I sound harsh, but if your friends do not want to be there for you, you might want to invest in some new ones:/
No, none at all having somebody there for you and you being there for them is what makes you two come closer together the bond of friendship grows tight and stronger between you two. And don't listen to whoever says it isn't good because if somebody is telling you that ignore them....