I can see three alternate visions of "Playing Alice" that would each end up with Chen in her underwear with a mild desire to act out.
1) Playing _With_ Alice Alice: Oh, Chen, thank you for coming to my dolls' tea party. They don't often get to have such cute visitors like you. *Chen smiles.* Alice: Oh, no! Clumsy, clumsy Hourai! She has spilled tea all over your clothes. Quick, you'd better take them off before they stain. Perhaps my dolls could give you a bath? Let's all go in together!
2) Playing "Alice Game" Tewi: I know! We can play Rozen Maiden! You be Shinku and I'll be Suigintou. *Chen nods trustingly* Tewi: "Oh, Shinku, I can't take your Rosa Mystica by force. But maybe I can take it -- from your body! *glomp* *grope* *flower falls from nearby tree*
3) Playing Alice in Imperishable Night Tewi: Let's play Imperishable Night! You be Alice and I'll be Marissa, okay? *Chen nods trustingly* Tewi: Here we go, ze! *RAPE*
