"I don't like sleeping with men, especially ugly ones." - QUOTH Vash while being attacked in his bedroom, Lost July.
TOLD YOU HE WASN'T GAY
HE SAYS HE DOESN'T LIKE SLEEPING WITH MEN!
NYEH-NYEH NYEH-NYEH NYEH NYEH!
In the episode "Murder Machine", Wolfwood is talking about how he can't believe Vash is really "Vash the Stampede." He twists Vash's head around 180 degrees backwards so he is looking at Meryl, and Vash's body follows after. Wolfwood twists Vash's body back to face him, but Vash's head refuses to move, and Vash stares at Meryl with these sort of sad eyes when Meryl says "I had some serious trouble believing it, too." As if Vash's pride is hurt by Meryl not believing him.
Dun dun dunn!!!
In the episode "Vash the Stampede", when Meryl and Milly see Vash's scars, he comments, saying something like "I don't usually like letting girls see these scars. I'd think it would make them run away." Meryl responds with, and I quote, "I wouldn't run away. ...I mean, they wouldn't run away!" This proves Meryl's love for Vash a little more, but still, SO MUCH OTP. Because this way Vash doesn't have to be scared to show his scars to Meryl anymore. WE ALL KNOW THIS. But still. I like it. YEEHEE.
In the episode "Hang Fire", when Vash says "Long time no see" on the cliff, THE LOVE ABOUNDS. I'm serious. I watched that segment over and over again. And it's basically saying "I MISSED YOU SO MUCH YOU FOOL." I really wanted Meryl to lean on Vash's shoulder. But that's probably just because I have a thing for shoulder-leaning. As well as the classic hand on face tactic. But that's another story.
In the episode "Alternative", Vash can't keep his eyes off Meryl while she takes care of the kids and teaches them to cook. He has that sweet little smile on the face during the latter, and Wolfwood sees how he is smiling and comments on it, saying how Meryl is really something. Vash agrees.
And of course, there is the fact that he trusts her enough to tell her EVERYTHING about who he is before he leaves. Everything. He even tells her about Rem, because later when he's on the cliff and crying about he needs to go see Rem, Meryl understands what he's saying (she's not like, who the hell is Rem?). Of course, she does say "you're not making any sense" because basically he's saying he wants to commit suicide and die, and he says that's the one thing he despises most (suicide).
And later in the episode he tells her not to worry, he'll be okay. Which acknowledges that Meryl would be worrying about him. And that he realizes this. And that. SHE TOTALLY LOVES HIM AND HE KNOWS IT. And it's a secret subtext promise that he'll come back and they can make babies together.
HE KISSES HER! IN THE ANIME! IN THE EPISODE "LIVE THROUGH"! HE KISSES HER ON THE CHEEK WHEN HE'S HUGGING HER!
NOT EVEN JOKING! Go check it out! Meryl's left eye goes all smooshed and Vash makes a "Mwah!" sound which totally sounds like he just kissed her. On the cheek. But still. HE KISSES HER FOR GOODNESS SAKE!
In other news, the fact that Meryl can pick up and shoot Milly's stungun with her feet always amazes me. IF ONLY MY FEET WERE SO STRONG AND FLEXIBLE!