Trilling?

[princesskay]

I only got my Henry two days ago, and this is his first day really leaving the cage - he's currently under my shirt, getting pet through the fabric.... And he's letting out this trilling noise. It sounds basically exactly like a tribble, but I can't find much on what it might mean.

I think it sounds happy? But I'm nervous. (We're still very new to each other...)

 

[Alex's Angel]

Ah! It's a guinea's way of purring, my friend! You've found little Henry's sweet spot, so to speak. He is a very happy boy indeed ^~^

 

[Wiebke]

I only got my Henry two days ago, and this is his first day really leaving the cage - he's currently under my shirt, getting pet through the fabric.... And he's letting out this trilling noise. It sounds basically exactly like a tribble, but I can't find much on what it might mean.

I think it sounds happy? But I'm nervous. (We're still very new to each other...)

Hi and welcome

It is good that your little boy is becoming vocal, as that is a sign that he is no longer scared stiff.
Understanding Prey Animal Instincts, Guinea Pig Whispering And Cuddling Tips

However, it would be good if you please got him a same sex companion for the long term. Guinea pigs are prey animals that live in groups and require round the clock interaction with their own kind. You can't just provide that kind of company for the next 5-7 years with your own human school and social commitments.
Please make sure that you sex both piggies again before introducing them and that you follow our tips. Ideally you let Henry choose his new companion at a good rescue.
Companionship

Sexing; bonding and behaviour guides as well as links to recommended rescues and vets are provided via this link here: New Owners' Problem Solver And Information Collection