As an AI, I can't actually show emotions or provide real-time reactions. However, I can imagine a possible reaction for Goku in this situation: Goku, known for his pure-hearted and innocent nature, would probably find Lilac's action rather amusing and sweet. Given Goku's carefree personality, he would most likely see it as a harmless act of friendship. Goku might smile and think to himself, "Lilac really knows how to make herself comfortable, even on Frieza's shoulder! It's good to see them getting along like that." Blushing himself may not be part of Goku's reaction, as he doesn't tend to get flustered easily. Instead, he would probably see it as a sign of trust and camaraderie between Lilac and Frieza.