Hello?

In the circumstances we have, yes. Also she shows obsessive qualities aside from the kiss

1. He's unconscious/chained and she's touching his hair going "it was always him" "I know he grieved me"

Do you know everything he lost because he grieved you ? I genuinely would've never looked up spoilers if I knew this was what happened

2. One situation I pieced together was her saying she'd let them out of the room if he kisses her and then the whole "kiss me like you mean it" and "did you think of Lyra when you were kissing me" (which implies even she knew he didn't want the kiss)

BUT jamie isnt doing well and she's saying in another quote "I know you won't leave your brother" so essentially I think she's asking him to kiss her in exchange for letting them go and he does it to save Jamie (even if that's not the case, he's hostage while she asks him so consent is NOT clear) therefore I would consider it SA

I really really hope its fake and never happened because 1. I don't forget words/scenes and this will haunt me for years 2. What was the point of all his grieving? Like genuinely both brothers suffered so much. Gray throughout the books and Jamie (even if u counter saying he healed first) 1. He was looked at "differently" at school 2. Thea was accusing them in their own house 3. He jumped off CLIFFS and suffered and Tobias the "great" was disgustingly aware and didn't do a thing