Of course. Sougo and I both love you. We'd be happy to have you there. [Lacus doesn't always feel confident speaking for Sougo, but in this case she can't imagine he'd feel otherwise. The only worry she has is not letting Sougo feel neglected as she inevitably fusses over Aidan while he's grieving. It's probably best that she not be quite so openly affectionate with Sougo for a while lest they inadvertently remind Aidan of what he's missing.]
We can all help each other. [Yes, right now Aidan needs the most help, but she wants him to know that his presence will be as soothing to herself and Sougo as she hopes theirs will be to Aidan. To make it clear he's not even a little bit a burden.] Whenever you'd like to come and see it, I'll get you a key and anything else you need. [Like a lot of post-drinking aspirin and a cold compress...]