[Female][Kink] Is it weird that I find thumb-sucking comforting when I'm being penetrated?

For some reason sucking my partner's thumb when they fuck me makes me feel a lot more comfortable and relaxed. I feel really weird about it—it seems kind of childish. I also just kinda have some kind of OCD need to have more than one hole penetrated, or to be shared between two people, or else I feel wrong. I'm kind of wondering if this has to do with my history of being sexually assaulted and I dunno what to do about it. I can kind of tell it weirds guys out when I do it/ask for it.