Whoops. Foot, meet mouth. The plate makes an appearance, and he's patting Sans's hand a moment later, instead of taking a cookie. Such a small bony hand, on such a young skeleton... his expression softens.

"☠⚐📪 ☠⚐❄ ☼☜✌☹☹✡📬 ✋🕯💣 ⚐☠☹✡ 💣✌😐✋☠☝ ❄☟✋☠☝💧 ✞🚩 ✌☝✌✋☠📬 ✋🕯💣 ☠⚐❄ ☝⚐✋☠☝ ❄⚐ 👎✋💧✌🚩🚩☜✌☼📪 👍⚐⚐😐✋☜💧 ⚐☼ ☠⚐ 👍⚐⚐😐✋☜💧📬"

Somehow a pat on the hand has turned into holding that hand, which is swallowed up by Gaster's much larger one.

"✡⚐✞ 👎⚐☠🕯❄ ☟✌✞☜ ✌☠✡❄☟✋☠☝ ❄⚐ 👌☜ ✌☞☼✌✋👎 ⚐☞📬"