Holly Blue ovipositing, unusually on Cotoneaster

This Holly Blue laid several eggs on a Cotoneaster in my garden, which is very unusual.

Female Holly Blue making a dummy run at laying an egg
on this Cotoneaster leaf

After the practice run, the female decides to do it properly and starts depositing several eggs on the flower buds of the Cotoneaster.

The Holly Blue ovum on the flower bud of the Cotoneaster flower.

A close-up of the Holly Blue ovum.