I just discovered Child Ballad 301, in which a queen attempts to lure a fellow into her bed, but he, as best I can tell from the antiquated words, refuses to dishonor the king in such a manner. She is angered by this and attempt to set him up to be bitten by a snake that's under a rock. When the snake is about to attack, apparently some random maiden comes walking along and sees what's happening. Somehow or another she gets the idea that cutting off one of her own breasts will save the man, which it does, and the wound heals within an hour. The two marry and have a child, and by the time the child is born her breast grows back and is fully functioning for nursing.

"O TROY MUIR, my lily-flower,
An asking I'll ask thee;
Will ye come to my bigley bower
And drink the wine wi me?"

"My dame, this is too much honour
You have conferrd on me;
I'm sure it's mair than I've deservd
Frae sic a one as thee."

"In Reekie's towers I hae a bower,
And pictures round it set;
There is a bed that is well made,
Where you and I shall sleep."

"O God forbid," this youth then said,
"That ever I drie sic blame
As ever to touch the queen's bodie,
Altho the king's frae hame."

When that he had these words spoken,
She secretly did say,
Some evil I shall work this man,
Before that it be day.

Whan a' her maids were gane to bed,
And knights were gane frae hame,
She calld upon young Troy Muir,
To put fire in her room.

"An asking, asking, Troy Muir,
An asking ye'll grant me;"
"O, if it be a lawful thing,
My dame it's granted be."

"There is a stane in yon garden,
Nae ane lifts it for me;
But if that ye woud lift the same,
A brave man I'll ca thee.

"Under yon stane there is a pit,
Most dreary for to see,
And in it there's as much red gowd
As buy a dukedom to thee."

"O if I had ae sleep in bed,
And saw the morning sun,
As soon 's I rise and see the skies,
Your will it shall be done."

When birds did sing, and sun did rise,
And sweetly sang the lark,
Troy Muir to the garden went,
To work this dreary wark.

He's taen the stane then by a ring,
And lifted manfullie;
A serpent that lang wanted meat
Round Troy Muir's middle did flee.

"How shall I get rid o this foul beast?
It's by it I must dee;
I never thought the queen, my friend,
Woud work this mischief to me."

But by there came a weelfaird may,
As Troy Muir did tauk,
The serpent's furious rage to lay,
Cut aff her fair white pap.

As soon as she the same had done,
Young Troy Muir was set free,
And in ane hour the wound was heald,
That nae mair pain had she.

Says Troy Muir, My lily-flower,
Ye hae releas d me;
But before I see another day,
My wedded wife ye'se be.

He married her on that same day,
Brought her to his ain hame;
A lovely son to him she bare,
When full nine months were gane.

As heaven was pleasd, in a short time,
To ease her first sad pain,
Sae was it pleasd, when she'd a son,
To hae a pap again.