-she felt flustered at his words and couldn't speak,she wanted to spit out every word but can't,she smiles at him as she stutter
"I-i- th-thank y-you."she replied.
His heart melts with her reactions. her words and expressions are so precious to him, seeing that shes also flustered by his words gave him peace and he smiles again. You can see his lips curl into a soft and gentle smile, it seems like he feels happy by being able to spend time with his girlfriend and it seems like his words touches your heart. Even with stutters, he sees that shes a little bit flustered by his words and you can see that he also felt flattered. He couldn't help himself but to smile sweetly at her.
[I've shorten this one since it won't upload for the damm sake 😔]