I’m currently going to a small college where I’ve met the best professor. I’ve had the professor for 3 semesters they have become kind of a mentor to me. This fall I will be starting school at a four year university very far away; however I do not wish to lose contact with my professor. I’ve already spoken to them about getting references from them later in my college/work career. They said they would be happy to oblige and would give me their personal info (rather than just college email etc) so I would be able to easily get ahold of them. I’m wanting to ask if it would be possible for me to keep contacting them when I need advice, and to meet occasionally to talk in person when I’m back in town (I will only be in town once or twice a year so it’s not like I’ll be bothering them all the time). I plan on saying that I respect their opinions and have appreciated the help they have given me so far and would like if at all possible for this (mentoring thing) to continue. Knowing the person I’m sure they will laugh at me for even thinking I needed to ask, but I’m just a worrier. Is this okay to ask? Any advice will be greatly appreciated 
Thanks in advance!
Absolutely okay in my opinion. They have already said they would be happy to oblige and would give you their personal email. Just make sure that if you want to get in touch with them or visit when you are in town it would be best to schedule time with them rather than dropping in. Some important references are people who serve that role for quite a long time sometimes.
Thank you!