Discovery.
Though Alice complained again and again in the end she couldn't stop Sam from taking the two young Valkyries with him. To be more accurate neither Miku nor Zero Three wanted to listen to what she said and followed after him.
In the end, all she could do was threaten him saying if he put his hands on either of them she would never forgive him, and that their relationship would be over, but Sam didn't really have much choice in the matter since those two were acting according to their own free will. He wished she would stop talking as if he had groomed them or something.
'It's not my fault if they end up falling for me.' He thought to himself, desperately trying to convince himself that being in a relationship with two underage looking beings isn't wrong.