" And yes, the conventional thinking would be that kissing would indicate a relationship that also includes sex"
No that's where you're jumping the gun. Not all kissing leads to sex. They are ways of showing intimacy and physical closeness.
Does your W ever come up to kiss you or do you just do it to her? What about hugs?
If she doesn't object to it, you could always just grab her, tell her that you're happy to have her in your life, give her a long lingering kiss and then walk away. No sex.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.