Well it actually turned out as more of a Cream/Tails/Cosmo kind of thing. Cream has a crush on Tails but knows that nothing can happen because he loves Cosmo. Later on she wonders how he'd react if she told him and realises that he'd just be torn between his feelings for Cosmo and not wanting to hurt her, so she decides to keep quiet. Just my little tribute to two of my favourite pairings - hope you like it!
The song is "Crush" by Mandy Moore.