Kendrick resisted the urge to move towards the entrance and hover to see what was happening, and the urge was shut when he heard the door click closed. He knew that if he were actually Billie's father or something maybe he should have gotten the door instead, but he was just her guardian and Phillip was not, he gathered, her boyfriend, and he was trying (too?) hard to be cool.
The protective part of him that had served him so well when it was Briony he was looking after wanted information. Phillip was old enough to Apparate here and Billie was only fifteen. Billie was obviously crazy about him - she'd never said as much out loud but even Kendrick, who, as a teenage boy at the time, had never been trustworthy enough to get the full brunt of teenage girl gushing, was pretty sure Billie's level of it meant that she liked him. He didn't know what Billie thought about love - not the kind of love she had for him, the childish trusting kind, but the adult sort - so he didn't know what level it was at and at any rate didn't believe she could really be in love even if she thought she was at that age, but he also knew that her thinking of it mattered. At any rate, her level of investment coupled with the day that she had come out of her room with a weird note in her voice saying that Phillip was staying with some other girl over the summer made him anxious to know if Phillip was just leading her on or something.
Of course, that was another thing to be nervous about. Who really thought Kendrick of all people would be discerning enough to tell even if he was leading her on? But there was no one else who could figure it out and help her. It was a lot of responsibility, Kendrick was feeling, and although he considered himself fairly mature in the ways that mattered (if absolutely childish in all the ways that didn't), he was still only 31 years old. For Merlin's sake, Jo was only just pregnant with their first child now. It was like he was having to fill the role that Billie's father should have played at her age (except he hated the idea even though he hurt that she felt the loss, because who knew what gentle, wholehearted Billie would be like if she'd stayed surrounded by all those Death Eaters) without going through any of the more mundane diapers or stopping-toddlers-from-falling-off-tables that helped you grow into your fatherly responsibilities in between.
A few moments later, he heard the door open again and, after rubbing his hands together briefly, looked up at the sound of footsteps. "Hi!" Billie seemed nervous, and Kendrick tried to make his own smile reassuring. Phillip came into view, a tall young man (at least compared to Billie, if not to Kendrick) wearing nice if slightly worn clothes, or so his quick up-and-down glance told him. Kendrick offered him a grin in return for his politeness. "No problem, happy to have you. It's nice to finally meet you, Phillip." He nearly followed up with 'I've heard good things' but that would probably embarrass Billie so he refrained. "Um," he clapped his hands together, looking around a little awkwardly, and then pointed them at the scones, which were now cooling on a second plate. "I er, baked some scones, no I did not make the batter Billie, and I made sandwiches, if you're hungry? And tea. Feel free to help yourself," he said, sliding two plates and cups toward them and grabbing a sandwich himself. "Oh, and this is Bo," he pointed at the dog, who perked up on hearing his name, though he was still sat patiently. "I don't know how you feel about animals or anything but he doesn't have an aggressive bone in his body, Billie can confirm, so don't worry if he comes up to you, he just wants to make friends." That was probably...too much talking for trying to be unobtrusive, but he thought Billie had said that Phillip was kind of quiet sometimes. Hopefully it was the putting-at-ease kind of talk and not the intimidating-too-many-words kind.
Sitting down at the table across from them, he took a bite of the sandwich, trying to keep the atmosphere casual. He screwed up his face for a second, trying to place something odd about the taste, but then reminded himself he had company. "Sorry, just trying to figure out if the mustard's gone off," he chuckled. As far as he remembered, mustard never really went off. It was probably fine. "So...how's your summer so far, Phillip? Billie said you were staying with a friend?"