For centuries, Tarantulas have been protecting frogs, because they eat the insects that are a potential threat to the tarantula's eggs, and, here you are... A tiny frog, resting under a tarantula.

"Hmm... Mmh..mfh.." Sarulo snores as he rests on top of you, and as you're on top of the hidden buried eggs of his, protecting it from insects, and getting a meal.