I don't really see it though, torulf has a really flirty way of talking but it's really different when he speak to arvo and when he speak with lake, and he don't really refuse when you propose to play with him against lake, idk just give me "upfront and embarrassed" friend style, not in a "relationship way"
hey i just went through old replies and now after having played the routes quite some times i see it tbh:
-while you eat dinner with lake he send a text to someone, maybe torulf
-if you ask torulf to stay in his room he says he need to "cancel something" without giving much more detail
-and yeah also the thing about lake going sneaking out of the room during the night
Being a visual novel those details probably have some meaning, maybe we're thinking too much on it but it's definitely suspicious