Weird Fetish?

So I had a really weird experience with my boyfriend.. We were making out and he was sucking my boobs while I gave him a hand job. Anyway afterwards he spoke about how much he enjoyed it and he told me that he imagined himself being a baby while sucking on my boobs and pretending to drink breast milk. Now I know guys have some weird fetishes but it just got me thinking if there's more to this than just a strange fetish? It made me feel a little uneasy.