If your llama loves you romantically, i suppose you could write:
僕のラマは僕のことを愛している。
If your llama just "really likes" you, I suppose you could write:
僕のラマは僕のことが大好きだ。
Question: is this T-shirt to be worn by guys or girls? If the latter, you'll have to use 私/あたし instead of 僕。