I know someone mentioned this in a comment already, but if you just want the last Gallery image featuring Ayu, either follow Path 2 and " tell cosmos to let go" in the 7th choice or just choose Ayu in most choices.

Path 1 (Cosmos in final H-scene)
Path 2 (Skipped final H-scene)
Path 3 (Ayu in the final H-Scene)

Here's my runthrough of Path 3:

Path 3

This is incredible
You're a total stranger I don't know you
You're that pervert from yesterday
I don't think you're dirty, but it is sketchy
Accept Ayu's apology
No, she looks incredible
Tell Cosmos to let go
I guess it's kind of impressive
I wish Cosmos would stop baiting Ayu

Merci Grazie

Thanks for the guide!

They were both the same tho...

thanks!

thx

Thanks!

thx

Thanks you!

THX :D