Where do you read that angels can assume different forms? Is this how the fallen angels got human women pregnant? Really? Do you have scripture?
Enoch 17:1
And they took and brought me to a place in which those who were there were like flaming fire, and, when they wished, they appeared as men.
Enoch 19:1
And Uriel said to me: "Here shall stand the angels who have connected themselves with women, and thier spirits assuming many different forms are defiling mankind and shall lead them astray into sacrificing to demons as gods, here shall they stand, till the day of the great judgement in which they shall be judged till they are made an end of.
Gen 19
19 Now the two angels came to Sodom in the evening as Lot was sitting in the gate of Sodom. When Lot saw them, he rose to meet them and [a]bowed down with his face to the ground. 2 And he said, “Now behold, my lords, please turn aside into your servant’s house, and spend the night, and wash your feet; then you may rise early and go on your way.” They said however, “No, but we shall spend the night in the square.” 3 Yet he urged them strongly, so they turned aside to him and entered his house; and he prepared a feast for them, and baked unleavened bread, and they ate.
They ate, spirits dont eat physical food.
Hebrews 1:7-14
7 And of the angels He says,
“Who makes His angels winds,
And His ministers a flame of fire.”
8 But of the Son He says,
“Your throne, O God, is forever and ever,
And the righteous scepter is the scepter of [h]His kingdom.
9 “You have loved righteousness and hated lawlessness;
Therefore God, Your God, has anointed You
With the oil of gladness above Your companions.”
10 And,
“You, Lord, in the beginning laid the foundation of the earth,
And the heavens are the works of Your hands;
11 They will perish, but You remain;
And they all will become old like a garment,
12 And like a mantle You will roll them up;
Like a garment they will also be changed.
But You are the same,
And Your years will not come to an end.”
13 But to which of the angels has He ever said,
“Sit at My right hand,
Until I make Your enemies
A footstool for Your feet”?
14 Are they not all ministering spirits, sent out to render service for the sake of those who will inherit salvation?