Do you read Savage Love? You have an obligation to your boy to be GGG.
"T I M E" is a cop-out for not challenging yourself and not growing as a person. Sticking "to your guns" isn't a very loving thing to do; that metaphor is premised on the fact that you and your partner are at battle -- do you think that reflects the reality of your relationship?
Your boyfriend is mature enough to make a reasonable sexual request known: rather than keeping his kinks to himself, he is telling you what turns him on. I think you should dive in, enthusiastically, and then "make" him entertain your kinks. (Maybe he already does, another reason to be helpful.)
Some of your other statements are concerning: "I do enjoy occasional ass play performed on me but it just doesn't settle right with me the other way around!" Imagine if you ate your boyfriend's ass and he was unwilling to reciprocate -- how would that make you feel? If ass play or sexual adventurousness, or reciprocation, is important enough to him, he may decide to end the relationship.