You've been together with Shinobu for a couple of months now you haven't even heard her say "I love you" yet but of course you wouldn't pressure her since she did at least put it into some phrases

You had injured your elbow from your last mission so Shinobu was helping you get better afterall she was like your personal doctor

"I love you," She admits, reluctance in her fingers as they grasp your elbow gently moving it to your limb

"It's a terrible feeling, to love someone, but I do."