Peeps here celebrating that "finally he did it", but fuck that: FINALLY, FUCKING FINALLY SHE DID IT! She actually went and held down a step she took without immediately pulling back and leaving her partner hanging in the air. That's the entire point stopping any progress thus far and now the brakes got removed. She did it ten steps after it should've been done and the sorry lad is still a stiff breeze away from full blown panic, but mistakes happen they're there to be fixed. Now they just need to climb down that ladder a bit to go back up with more surety, but that's just a matter of doing it.
And let it be clear, the issue Seto has isn't with performance anxiety or the her feelings about him (or the other way around), it's his discomfort about the uncertainty of his situation and the level of stakes at play. There's no way for him not to be uncomfortable at a (even remotely) sexual situation, when he isn't even at a comfortable position of hugging or being hugged yet. He doesn't talk about studying as in some technique of rocking the boat (WTF you absolute dorks), but about progressing skinship.