do you think clarke was planning on kissing/sleeping with lexa when she walked in the room or did lexa just blow clarke away with how beautiful she looked and she just couldnt resist her anymore
No I don’t think so. She went in there with the idea to say goodbye.
She freezes in place when Lexa appears, blown away for a moment. Petrified by Lexa’s beauty and probably by the realization that she really doesn’t want to leave, that she wants to stay there with her. It is Lexa who talks first, because she already realized why Clarke is there.
Clarke answers “Now.” She was ready to leave right then. Her entire speech to Lexa is a goodbye. “I’m sorry.” “Maybe someday…” She is preparing herself to leave Lexa, giving herself (and them) some hope for a future that she isn’t even sure she believes in. Deep down she knows that they will always be bound to their people in some way, and Lexa knows too. She knows it more than Clarke. But she still smiles and says “I hope so…” She tries to give Clarke the hope she needs. And then they shake hands, Lexa says “May we meet again.” and I think that’s when something clicks in Clarke.
This is happening. They are saying goodbye. They are leaving each other, she doesn’t know for how long. It might take months before they see each other again. Hell, they might never see each other again. All these “maybe”s, all these words about the future feel empty, because the future is just a concept. Something volatile, something intangible. But this moment they have right here? This is real. Lexa is real. She is right in front of her, painfully beautiful, with a warm hand on her arm and tears in her eyes. And Clarke doesn’t have it in her to resist. She cannot waste what could be the only moment they have that is only theirs, and then live with the regret. She just can’t.
So she kisses Lexa. And kisses her again, and takes off her clothes and makes love to her and everything else fall away because in this moment it’s them, together, and nothing else exists.